Shimano dura ace r9100 spd sl clipless pedalsby re examining every aspect of previous dura ace spd sl pedals shimano was able to save 24 5g with the new 9100 pedals while still providing legendary spd efficiency stability and durability they feature hollow cleat bolts and an open layout for efficient power transfer and excellent stability features excellent pedalling efficiency optimised balance of weight and rigidity injection moulded carbon composite body hollow cleat bolt